Sean Monterrosa was a 22-year-old Latino American man who was fatally shot on June 2, 2020, by Vallejo police officer Jarrett Tonn.

[2][5] Less than an hour before Monterrosa was shot, he texted his sister a petition demanding justice for George Floyd, who was murdered by Minneapolis police a week earlier.

[1] Fifteen days after the fatal shooting of Monterrosa, Tonn was named in an unrelated excessive force and civil rights lawsuit in federal court.

As the truck arrived at the scene, the detective in the backseat mounted and aimed his rifle; the body camera he was wearing did not record sound in the seconds preceding the encounter.

Just as the truck came to a stop, the detective in the back seat, later determined to be Jarrett Tonn, fired a rifle five times, through the windshield of the vehicle.

[15] Tonn claimed Monterrosa appeared to be running towards the black sedan involved in the chase but he suddenly stopped, took a kneeling position, and placed his hands above his waist.

[1][17] On July 2, 2020, Solano County District Attorney Krishna Abrams announced that she would recuse herself from investigations into the shooting, despite her office's key role in potential criminal charges against Tonn.

[19] In 2022 an independent third-party investigation found that Tonn had violated several department policies, including unreasonable deadly force, not de-escalating the situation, and not activating his body-camera.

[22][23] On June 16, 2020, the San Francisco Board of Supervisors passed a resolution urging the city of Vallejo to release the body camera video of the incident.

When asked to explain the delay in informing the public that an officer had killed someone, the chief stated that at the time of the initial statement Monterrosa had not been pronounced dead.

[14] In a press conference on June 5, 2020, the police chief said that the officers saw Monterrossa running toward a car at the scene, that he stopped, took a kneeling position, and placed his hands above his waist, revealing what appeared to be the butt of a handgun.

[1] On June 15, the Vallejo police union filed a temporary restraining order to prevent the release of the name of any officer involved in the killing.

The arbitrator found that Detective Tonn's use of deadly force was legally justified based on the proper application of California AB 392.

Further, it was determined the indepentend investigating entity contracted by then Chief Shawny Williams came to their conclusions in a flawed manner, contrary to well established law and United States Supreme Court precedent.

[42][43] On February 10, 2021, United States District Judge Troy L. Nunley denied a change of venue motion filed by Tonn.

[45][19] On April 2, 2021, Monterrosa's sisters called on Attorney General-nominee Rob Bonta to meet with their family and to appoint a special prosecutor to investigate all officers involved in the shooting and the destruction of evidence.

[47] In June 2020, protesters began gathering in Vallejo and across the Bay Area to ask for officers involved to be charged "to the fullest extent of the law" and to call for the release of body camera video.

[54] A group of 17 protestors, including Monterrosa's sisters and members of Justice League CA, demanded Newsom appoint a special prosecutor to investigate the case.